Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 33: Top Quarks: Production (Exp.) 2

T 33.9: Vortrag

Dienstag, 22. März 2022, 18:15–18:30, T-H18

Search for ttγγ production in pp collisions at √s=13 TeV with the ATLAS detector — •Arpan Ghosal, Ivor Fleck, Carmen Diez Pardos, and Amartya Rej — Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen

The production of top quarks with photons gives access to measure the strength of the electroweak coupling of the top quark and the photon. While the production of top quark pairs (tt) with one photon is being extensively studied, the tt production in association with two photons (ttγγ) has not been observed yet. The ttγγ is a rare process and not only is it a good candidate for probing the top EW coupling but is also relevant as an irreducible background process to tt production in association with a Higgs boson decaying to two photons (H→γγ). Besides, new sources of CP-violation are expected from physics phenomena beyond the SM. These sources can appear as electric dipole moment terms in top-quark interactions, and their precise measurement is essential to determine the effects of new physics. Understanding the ttγγ process can help put better bounds on top-quark dipole moments.

The cross-section of the process is expected to be of the order of 10 fb at √s=13 TeV, much lower than the ttγ process. The presentation will discuss the ongoing efforts in the search for the process in semileptonic tt decay channel using the full Run 2 dataset collected by ATLAS detector at 13 TeV.